How can I build a custom `PickerStyle` in SwiftUI?

I am trying to create a radio group picker in SwiftUI, similar to this: https://www.neobrutalism.dev/docs/radio-group

I already have a working view based version here: https://github.com/rational-kunal/NeoBrutalism/blob/main/Sources/NeoBrutalism/Components/Radio/Radio.swift

Now I want to replace it with a more concise/swifty way of Picker with PickerStyle API:

However, I can't find any official documentation or examples showing how to implement PickerStyle. Is it possible to create my own PickerStyle? If not, what’s the recommended alternative to achieve a radio‑group look while still using Picker?

struct NBRadioGroupPickerStyle: PickerStyle {
    static func _makeView<SelectionValue>(value: _GraphValue<_PickerValue<NBRadioGroupPickerStyle, SelectionValue>>, inputs: _ViewInputs) -> _ViewOutputs where SelectionValue : Hashable {
        <#code#>
    }
    
    static func _makeViewList<SelectionValue>(value: _GraphValue<_PickerValue<NBRadioGroupPickerStyle, SelectionValue>>, inputs: _ViewListInputs) -> _ViewListOutputs where SelectionValue : Hashable {
        <#code#>
    }
    
}

Crossposting: https://forums.swift.org/t/how-can-i-build-a-custom-pickerstyle-in-swiftui/80755